Because UNIX terminals vary widely, the keys documented in the books may not be available on your keyboard. Also, most UNIX terminals do not recognise the Alt or Ctrl key when they are pressed, so Studio Enterprise Edition for UNIX cannot detect these keys. The UNIX Key Usage Chart lists alternatives for keys that might be undetectable on your specific UNIX terminal, and shows which keys you can configure.
The chart also tells you how to select soft or hard operation for the Alt and Ctrl keys. With soft operation, the Alt or Ctrl key is automatically turned off after the next keystroke. This means that whenever you want a function from the Alt menu you must hold down Alt again to get the Alt menu displayed; and similarly with Ctrl. With hard operation, the Alt and Ctrl keys work in a similar way to the Caps Lock key, in that having been pressed they remain in effect until pressed again.
For information on configuring your keyboard, see the chapter Development Environment Menu System in your Utilities Guide.